Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73a7783e697d5b2…

MALICIOUS

PDF

82.2 KB Created: 2021-06-24 11:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ca8effeefeb08ed889a5db72c6a26af2 SHA-1: 0dd734d4950c75ac02128fb324289591472d31e2 SHA-256: a73a7783e697d5b2edeecae5cce1dccd6dfee3af2e1307e87e8f453996f1d5e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host or distribute further malicious content. The embedded URLs, such as http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0185c45bc---divanizasa.pdf, are likely part of this distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27095b4e7e---lobonumigakunalutawesumil.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad757ab70f3---ginosatodalejurubo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/49270931308.pdfIn PDF document text
    • http://poorclarescork.ie/images/35266790156.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0185c45bc---divanizasa.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/bikapagivomogeleguzajoba.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c930953ccb4---83105720782.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b61b2eb7f---2461424528.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/67442318346.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b091ea128---4141359706.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/97760622165.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r4400pvjbiiu1d6mb0cbu8n6fj/31561780257.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/19585139614.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f736f6fcf6---61361610032.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bae4780f2---gijogitize.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/775511a9c4baec40f16caf3e4b7674e6/nebuvaposalodes.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e6182348---luzisovokodak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=supply+chain+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 5584 bytes
SHA-256: 1e9805b601395e320060da7d80f343cd98c7745b468ce46356e54767782dbfc8
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 11388 bytes
SHA-256: 5fcd5f107ddc58492c5131b8c67a61ee24f5b22003df86159984637c4f10f474